What does the public network and intranet mean?

The Internet is the Public Network. The differences between the intranet and the public network are as follows:

1.IP addresses are different.

The IP address obtained from the public computer is a non-reserved address on the Internet. Computers on the public network and other computers on the Internet can access each other at will.

2.Access is different.

The external network is a network that can access the Internet without a router or switch, and can be directly accessed by the outside world, without the need for equipment, directly connected to the computer.

3.The defense is different.

Compared with the external network, the internal network will have an extra layer of security firewall (external network routing) to resist the attack ability from the external leakage and dismantling of the network.

The disadvantage of the intranet is that it can be attacked from within; Because of the shared bandwidth, the relative network speed may be slower, and the more terminals, the slower.

4.The type of network is different.

An intranet is a local area network, which refers to a group of computers interconnected by multiple computers in a certain area. A LAN is closed and can consist of two computers in an office or thousands of computers in a company.

The extranet is the wide area network, which is a remote network that connects the computer communication of the local area network or metropolitan area network in different regions. It usually spans a large physical range and covers a large area, forming an international long-distance network.

5.The access methods are different.

Computers on the intranet access the Internet through a public gateway using the NAT (Network Address Translation) protocol. The state clearly stipulates that the internal network and the external network are physically isolated, and the external network and the Internet are logically isolated.

Computers on the intranet can send connection requests to other computers on the Internet; Other computers on the Internet cannot send connection requests to computers on the intranet.

The intranet is also known as the local area network, and the computers on the intranet access the Internet through a public gateway using the NAT (Network Address Translation) protocol. At this stage, there is no network connected to the Internet, which is called a local area network, commonly known as an intranet.

In layman's terms, the extranet is connected to the Internet and can access all network resources on the Internet. The basic network of ineternet is commonly known as the external network. That is, the Internet (Internet), which is a collection of computer networks (including local area networks, metropolitan area networks, and wide area networks) that connect computer networks of different locations and scales around the world.

The WWW sites, FTP sites and instant messaging software that we usually browse and communicate with are applications that serve the Internet, so they are also called "web applications".

The public network is the ordinary circuit switching network, that is, the backbone and branch network set up by Netcom, telecommunications, and Tietong. The public network can be understood as the external network, which corresponds to the internal network.

Generally speaking, we call the network built by the operator as the public network, which is mainly responsible for connecting the networks of various companies or homes, and the IPs in it are all public IPs, and only the routes composed of public IPs will appear in them, so after the private IP enters the public network, there is no route and will be discarded, so if the private network accesses the public network, you need to SNAT, and replace the private IP with the public IP.

In the case of intranet, it can be simply understood as a private network, but in fact, the starting point of this concept draft is that for enterprises, it is called private network within the enterprise, and it is called the external network outside the enterprise.

Conceptually speaking, a network other than an enterprise can include the operator's network - the public network, and can also include the network of other enterprises or households - the private network. Therefore, the external network and the public network cannot be equated.

In fact, there is no special distinction, public network = external network, private network = internal network, which can be simply understood. The AR7091 is integrated with public and private networks, and supports special applications such as code traces, hardware encryption, and network encryption of the State Grid.

1. Intranet: also known as local area network (LAN), is a computer communication network composed of various computers, external equipment and databases connected to each other within a local geographical range (such as a school, factory and institution) within a radius of several kilometers.

2. Public network: The public network is relative to the internal network. The IP address obtained by the computer on the intranet is the reserved address on the Internet; The IP address obtained by the computer on the Internet is the public address of the Internet, and it is a stupid and non-reserved address.

Computers on the public network and other computers on the Internet can access each other at will.

3. Extranet: Wide Area Network (English: Wide Area Network, abbreviated as WAN), also known as Wide Area Network and Extranet.

It is a remote network that connects computer communication in different regions, either a local area network or a metropolitan area network. It usually spans a large physical range, covering a range of tens of kilometers to thousands of kilometers, and it can connect multiple regions, cities and countries, or across several continents and can provide long-distance communication with vibrillation, forming an international long-distance network.

1. The difference between IP address settings, generally the intranet has its own IP number segment, and it will not conflict with the Internet number segment, the intranet starts from the router below, and the IP is an IP starting with 192. Generally, it is not possible to have an extranet IP, because it is also a waste of resources for individuals or small groups to use the extranet, so they are generally used to access the Internet through the intranet, and the extranet IP is generally used for companies, schools, and other institutions.

2. The internal network computer connects to the external network and needs a unified exit, which may be restricted from some unnecessary access, while the external network can be accessed directly by the outside world without a router or switch, without the need for equipment, directly connected to the computer.

3. The intranet will have an extra layer of security firewall (external network routing) compared with the external network, and the ability to resist attacks from the external network will be relatively better, and the intranet may be attacked from the inside, because the bandwidth is shared, the relative network speed may be slower (the more terminals, the slower).

4. The IP of the intranet can be changed frequently, and you can define the rules by yourself, while the IP of the external network is generally fixed, and when you install the broadband, your IP will be fixed.

The public network (Internet) refers to the computer network that connects the whole world, which is composed of various interconnected networks and subnets, which can realize global communication and interconnection. The public network is maintained and managed by various operators and Internet service providers, and users can access various resources and services on the Internet through the public network.

Intranet refers to a private computer network within a local area, which consists of a local area network, a metropolitan area network or an internal network of an enterprise. Intranet is maintained within an organization, institution or enterprise, and realizes resource sharing, information transmission and collaboration between intranets. Intranets usually use a dedicated IP address range, which is not exposed to the public, and is only used for communication between internal members and devices.

The difference is that a public network is a global interconnected network that connects computers and devices around the world and can be accessed and used by users around the world. On the other hand, an intranet is a private, confined network within an organization or enterprise, and only allows communication and access between internal members and devices. The public network and the intranet are connected and communicated through various party commands and protocols, so that the internal network can access the resources on the public network, and at the same time ensure the security and privacy of the intranet.

Realize the internal LAN and public network (i.e., external network.

The most important premise of interconnection is that there is a backbone network (for example: the education and scientific research computer network of major universities) must be able to connect to the public network without any network failure; On the basis of ensuring this premise, you can connect to the public network through the gateway mold block configured within the organization.

However, the computer as a gateway must have two interfaces: one interface is connected to the internal LAN of the unit (the IP address of the gateway is in the same network segment as the internal LAN of the organization, such as the IP address of the local area network), and the other interface is directly connected to the public network (the IP address of the gateway is in the same network segment as the public network).

The public network generally refers to the Internet.

The external network and the internal network are generally only in the unit, and many units have their own internal network, which can only be accessed by the internal unit and are physically isolated from the outside, so it is called the intranet. Compared with the internal network, the external network that can be accessed is the external network, and the external network is generally the Internet, that is, the public network. Hope to adopt!

A public network is a male network (refer to the meaning of the word "public)".

Another said: in a narrow sense, the public network is the public network, that is, the legendary Internet; Broadly speaking, as long as there are multiple people sharing a network, it can be called a public network.

For example, if your organization has a network, the network outside your organization's network is the external network.

The intranet is relative to the extranet, that is, it is only the internal network, for example, the network of your organization is an intranet.